They are not cheesemakers, but if you are in London it is worth getting along to Neal's Yard cheese shop, which has a fantastic range. There are also some great cheese stalls in the nearby Borough Market, which has cheeses from the UK and Europe. (the 24month aged comte is a favourite of mine).

Not sure where abouts in Wales they are based, but the perl las is one of my favourite Blues, so definitely worth hunting down some.